Changing control units

To change control unit data, follow the same panel flow as for defining control units.

• Changing Control Unit Characteristics
• Changing Processor Attachment Data

The following steps describe the panel flow and where you can change the data.

1. On the Control Unit List select a control unit and the Change action from the context menu (or action code  c ).
2. On the following Change Control Unit Definition panel you can change the following data:
   • Control unit number
   • Type-model
   • Serial number
   • Description
   • Connections to switches/ports
   Note:

   You can also change these control unit definitions (except the control unit number and the connections to switches/ports) by simply typing over the appropriate columns on the Control Unit List.
3. After pressing the Enter key you see the Select Processor/Control Unit panel. Select a processor and the Select (connect/change) action from the context menu (or action code  s ).
4. On the following Change Control Unit Definition panel you can change the processor attachment data:
   • Channel paths / Link addresses
   • Unit addresses / Number of units
   • Logical address
   • Protocol
   • I/O concurrency level

When changing control unit data of control units that affect other control unit or device data (like unit address/ranges), a list is displayed that shows all affected control units and proposed new address ranges for those control units. A panel like the following one is displayed:

*--------------- Modify Affected Control Unit Parameters --------------------*
|                                                                Row 1 of 2  |
|                                                                            |
| Specify or revise any changes to the control unit parameters in the        |
| list below.                                                                |
|                                                                            |
| Processor ID  . . . . . . : PROC2                                          |
| Channel Subsystem ID  . . :                                                |
|                                                                            |
| CU   Prot. I/O +   -------------Unit Address . Unit Range + -------------- |
|      +     Conc.   1----- 2----- 3----- 4----- 5----- 6----- 7----- 8----- |
| 0012  S     2      20.016                                                  |
| 0013  S     2      20.016                                                  |
*----------------------------------------------------------------------------*

After you modified control unit data (like protocol, I/O concurrency level, or unit address range), and pressed the Enter key, the Modify Device Parameters panel is shown with the devices attached to the affected control units. The devices are grouped by ranges:

*------------------------- Modify Device Parameters ------------------------*
|                                                   Row 1 of 1 More:      > |
|                                                                           |
| Specify or revise any changes to the device parameters in the list below. |
| To view attached control units, scroll to the right.                      |
|                                                                           |
| Processor ID . . . .  : PROC2        This is the second processor         |
| Channel Subsystem ID  :                                                   |
|                                                                           |
| ---------Device--------- ---UA----                   Preferred  Exposure  |
| No., Range Type          Old New + Time-Out  STADET  CHPID +    Device    |
| 0012,016   3390          12  20    Yes       No      __                   |
*---------------------------------------------------------------------------*

HCD proposes starting unit addresses for the listed device groups.

Use the F20=Right key to scroll to the right to see the attached control units. Accept or change the definitions for unit address (UA New), Time-Out, STADET, and preferred CHPID.